fix checkstyle dep

Author: rbri

pom.xml

@@ -43,7 +43,7 @@
         <slf4j.version>2.0.16</slf4j.version>
 
         <!-- As a property, as it is included in Checkstyle build -->
-        <checkstyle.version>10.21.2</checkstyle.version>
+        <checkstyle.version>10.21.1</checkstyle.version>
         <spotbugs.version>4.8.6</spotbugs.version>
         <pmd.version>7.9.0</pmd.version>
         <junit.version>4.13.2</junit.version>